Muscle stimulation device



FIG. 1 is a front perspective view illustrating our design for a muscle stimulation device.

FIG. 2 is a left side view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a front view thereof.

FIG. 6 is a top view thereof.

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a rear perspective view thereof.

The broken lines in FIGS. 1, 3, 5, and 8 show portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a muscle stimulation device, as shown and described. 